Dimethicone

Appearance: This product is colorless, transparent crystalline or crystalline fine particles; Odorless; It is weathered in dry air and deliquescent in humid air; Weak alkaline reaction in aqueous solution;
Solubility: Highly soluble in water, insoluble in ethanol;
PH: 6.0-8.4;
Sulfate and sulfite: not exceeding 0.2%;
Sulfide: not exceeding 0.0005%
Related substances: The sulfite radical shall not exceed 0.15%, the tetrasulfate radical shall not exceed 0.15%, the maximum single impurity shall not exceed 0.10%, and the total impurity shall not exceed 0.50%;
Dry weight loss: 32.0%~37.0%;
Calcium salts: turbidity should not occur;
Heavy metals: not exceeding 0.002%;
Arsenic salt: not exceeding 0.001%;
Content: Calculated as dry product, Na2S2O3 content shall not be less than 99.0%.
Appearance: This product is a colorless and clear oily liquid; Odorless or almost odorless.
Solubility: This product can be mixed freely in chloroform, ether, toluene, or xylene, and is insoluble in water or ethanol.
Relative density: 0.967~0.975 at 25 ℃.
Refractive index: 1.4013~1.4053 at 25 ℃.
Kinematic viscosity: 500~1000mm2/s at 25 ℃.
PH: Adding sodium hydroxide titrant should result in a slight pink color, while adding sulfuric acid titrant should cause the pink color to disappear.
Mineral oil: The fluorescence intensity of this product should not be deeper compared to the control solution at 365nm ultraviolet.
Benzoate: The absorbance should not exceed 0.2.
Regarding substances: Impurities D3, D4, D6, MM, D5 should not exceed 0.10%, other individual unknown impurities should not exceed 0.10%, and total impurities should not exceed 0.5%.
Dry weight loss: not exceeding 0.5%.
Heavy metals: not exceeding 0.0005%
Arsenic salt: not exceeding 0.0002%.
Molecular weight distribution: The weight average molecular weight (Mw) should be between 20000 and 40000, and the distribution coefficient should not exceed 2.5.
Content: The content of polydimethylsiloxane should be between 97.0% and 103.0%.